How the European Union Works: A Guide to the World's Largest Political Union
The Architecture
The European Union is not a country, not a federation, and not a traditional international organization. It is a political and economic union of 27 member states that have pooled sovereignty in specific areas while retaining independence in others. The EU's legal foundation is a series of treaties — most recently the Lisbon Treaty of 2009 — that define what the union can and cannot do.
Power is distributed across four main institutions. The European Commission proposes legislation and enforces EU law. It is led by 27 commissioners, one from each member state, with a president elected by the European Parliament. The European Parliament, directly elected by EU citizens every five years, amends and approves legislation alongside the Council. The Council of the European Union — not to be confused with the European Council — represents member state governments, with ministers from each country meeting to vote on laws. The European Council, composed of heads of state, sets the overall political direction.
The Single Market
The EU's greatest economic achievement is the single market, which guarantees the free movement of goods, services, capital, and people across member states. A company in Portugal can sell to a customer in Poland without tariffs, customs checks, or regulatory barriers. A worker in Romania can move to Germany and work without a visa. Capital can flow freely across borders, enabling investment and competition.
The single market requires an enormous body of harmonized regulation. Product standards, environmental rules, labor laws, and competition policy are coordinated at the EU level to prevent any one country from undercutting the others. This regulatory harmonization is both the single market's strength — it creates a level playing field — and the source of much political tension, as national governments and voters push back against rules they did not choose.
The Euro and Monetary Union
Nineteen of the 27 member states use the euro, managed by the European Central Bank in Frankfurt. The euro eliminated exchange rate risk between members, simplified trade, and created the world's second-largest reserve currency after the dollar. But monetary union without fiscal union created structural tensions. Countries that share a currency but control their own budgets can run fiscal policies that affect the entire currency zone — as the Greek debt crisis demonstrated painfully.
The EU's response to that crisis was to build mechanisms for fiscal coordination and bailout funds that did not exist when the euro was launched. The Stability and Growth Pact sets deficit and debt limits. The European Stability Mechanism can lend to countries in crisis. These are imperfect tools, but they represent the EU's characteristic method: incremental institutional building in response to crisis.
The Edge Review explains politics for general readers. The EU's institutional structure is documented at europa.eu.